CDC2510C
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS621 – DECEMBER 1998
PW PACKAGE
(TOP VIEW)
Designed to Meet PC SDRAM Registered
DIMM Design Support Document Rev. 1.2
Spread Spectrum Clock Compatible
AGND
CLK
AV
1
24
23
22
21
20
19
18
17
16
Operating Frequency 25 MHz to 125 MHz
V
2
CC
CC
Static tPhase Error Distribution at 66 MHz
to 100 MHz is ±150 ps
1Y0
1Y1
1Y2
GND
GND
1Y3
V
3
CC
1Y9
1Y8
GND
GND
1Y7
1Y6
4
5
Drop-In Replacement for TI CDC2510A With
Enhanced Performance
6
7
Jitter (cyc – cyc) at 66 MHz to 100 MHz is
|100 ps|
8
1Y4
9
Available in Plastic 24-Pin TSSOP
V
10
11
12
15 1Y5
CC
G
Phase-Lock Loop Clock Distribution for
Synchronous DRAM Applications
V
14
13
CC
FBOUT
FBIN
Distributes One Clock Input to One Bank of
Ten Outputs
External Feedback (FBIN) Terminal Is Used
to Synchronize the Outputs to the Clock
Input
On-Chip Series Damping Resistors
No External RC Network Required
Operates at 3.3 V
description
The CDC2510C is a high-performance, low-skew, low-jitter, phase-lock loop (PLL) clock driver. It uses a PLL
to precisely align, in both frequency and phase, the feedback (FBOUT) output to the clock (CLK) input signal.
It is specifically designed for use with synchronous DRAMs. The CDC2510C operates at V
provides integrated series-damping resistors that make it ideal for driving point-to-point loads.
= 3.3 V . It also
CC
One bank of ten outputs provides ten low-skew, low-jitter copies of CLK. Output signal duty cycles are adjusted
to 50 percent, independent of the duty cycle at CLK. All outputs can be enabled or disabled via a single output
enable input. When the G input is high, the outputs switch in phase and frequency with CLK; when the G input
is low, the outputs are disabled to the logic-low state.
Unlike many products containing PLLs, the CDC2510C does not require external RC networks. The loop filter
for the PLL is included on-chip, minimizing component count, board space, and cost.
Because it is based on PLL circuitry, the CDC2510C requires a stabilization time to achieve phase lock of the
feedback signal to the reference signal. This stabilization time is required, following power up and application
of a fixed-frequency, fixed-phase signal at CLK, and following any changes to the PLL reference or feedback
signals. The PLL can be bypassed for test purposes by strapping AV
to ground.
CC
The CDC2510C is characterized for operation from 0°C to 85°C.
For application information refer to application reports High Speed Distribution Design Techniques for
CDC509/516/2509/2510/2516 (literature number SLMA003) and Using CDC2509A/2510A PLL with Spread
Spectrum Clocking (SSC) (literature number SCAA039).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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